Use powershell

Author: minggangw

.github/workflows/windows-build-and-test.yml

@@ -32,7 +32,7 @@ jobs:
         node-version: ${{ matrix.node-version }}
 
     - name: Install pixi
-      shell: cmd
+      shell: powershell
       run: |
         irm -useb https://pixi.sh/install.ps1 | iex
 
@@ -42,7 +42,7 @@ jobs:
         required-ros-distributions: ${{ needs.identify-ros-distro.outputs.distro }}
 
     - name: Install dependencies
-      shell: cmd
+      shell: powershell
       run: |
         irm https://raw.githubusercontent.com/ros2/ros2/refs/heads/rolling/pixi.toml -OutFile pixi.toml
         pixi install